Add a how-to for connecting AWS to your GitHub account

src/how-to/set-up/github-aws-connection.md

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+# Connect your AWS account to GitHub
+
+Before you deploy an app using AppPack, you should connect your GitHub account 
+to AWS using their app, which is available in the GitHub Marketplace, free of 
+charge. You can do it as part of the process of deploying an app, however the app 
+appears to make some assumptions regarding any organisations you belong to, so it 
+is best to set up the connection beforehand. This guide takes you through all the 
+steps, so you can deploy apps from any of the repositories  you have access to.
+
+First, visit [AWS Connector for GitHub](https://github.com/marketplace/aws-connector-for-github).
+Scroll down to the bottom to **Plans and Pricing**.
+
+1. If shown, select the account where you want to install the app.
+2. Click "Install".
+
+The **Install & Authorize** page will be displayed:
+
+![aws github app configuration screenshot](./../../assets/aws-gihub-app-configuration.png)
+
+1. At least initially, select **All Repositories**. 
+2. Click on **Install & Authorize** to install the app.
+
+You will be redirected to your AWS account. Sign in, then the **Connect to GitHub** 
+page will be displayed:
+
+![aws create connection screenshot](./../../assets/aws-create-connection.png)
+
+1. Enter the name of the connection. Any name will do.
+2. Click "Connect"
+
+The connection details page will be displayed:
+
+![aws connection details screenshot](./../../assets/aws-github-connection-details.png)
+
+1. Select the region where you want to use the connection.
+
+That's it. Now you can build applications from any of the repositories in your account.